Isn't a good thing length limits aren't generally enforced? As an example, Texas allows overall length of 65 feet. They allow 2 towed trailers or whatever behind the powered vehicle. But the overall length is still limited to 65 feet. The penalty is up to $200 for the first offense and goes up to as much as $1,000 and 6 months in jail. Most state statutes are so difficult to research and understand no wonder they are seldom enforced or even understood. As hungry as some jurisdictions are for revenue I wonder how long our free pass will continue. I know in the yachting world states like Florida, Virginia, and New Hampshire are digging in their heals on enforcement of property and use taxes. Deltaville, the former boat building capital of the Chesapeake Bay, has seen a mass exodus of yachts from their marinas. I had a conversation with the the tax collector of that county and she was just enforcing what wasn't in the past even though I'm sure she knew her actions were killing the livelihood of this quaint town.

Here's Texas Statute:
Sec. 621.203. MAXIMUM LENGTH OF MOTOR VEHICLE. (a) A motor vehicle, other than a truck-tractor, may not be longer than 45 feet.
(b) A motor bus as defined by Section 502.001 that is longer than 35 feet but not longer than 45 feet may be operated on a highway if the motor bus is equipped with air brakes and has either three or more axles or a minimum of four tires on the rear axle.
(c) The limitation prescribed by Subsection (a) does not apply to a house trailer or towable recreational vehicle or a combination of a house trailer or towable recreational vehicle and a motor vehicle. A house trailer or towable recreational vehicle and motor vehicle combination may not be longer than 65 feet.


Sec. 621.205. MAXIMUM LENGTH OF VEHICLE COMBINATIONS. (a) Except as provided by this section, a combination of not more than three vehicles, including a truck and semitrailer, truck and trailer, truck-tractor and semitrailer and trailer, or a truck-tractor and two trailers, may be coupled together if the combination of vehicles, other than a truck-tractor combination, is not longer than 65 feet.
(b) A passenger car or another motor vehicle that has an unloaded weight of less than 2,500 pounds may not be coupled with more than one other vehicle or towing device at one time. This subsection does not apply to the towing of a disabled vehicle to the nearest intake place for repair.
(c) A motor vehicle, including a passenger car, that has an unloaded weight of 2,500 pounds or more may be coupled with a towing device and one other vehicle.
(d) In this section:
(1) "Passenger car" means a motor vehicle designed to transport 10 or fewer persons simultaneously.
(2) "Towing device" means a device used to tow a vehicle behind a motor vehicle by supporting one end of the towed vehicle above the surface of the road and permitting the wheels at the other end of the towed vehicle to remain in contact with the road.


Sec. 621.507. GENERAL OFFENSE; PENALTY. (a) A person commits an offense if the person violates a provision of this subtitle for which an offense is not specified by another section of this subtitle.
(b) An offense under this section is a misdemeanor punishable:
(1) by a fine not to exceed $200;
(2) on conviction before the first anniversary of the date of a previous conviction under this section:
(A) by a fine not to exceed $500, by confinement in a county jail for not more than 60 days, or by both the fine and confinement; or
(B) if the convicted person is a corporation, by a fine not to exceed $1,000; or
(3) on a conviction before the first anniversary of the date of a previous conviction under this section that was punishable under Subdivision (2) or this subdivision:
(A) by a fine not to exceed $1,000, by confinement in the county jail for not more than six months, or by both the fine and confinement; or
(B) if the convicted person is a corporation, by a fine not to exceed $2,000.